Intersection · Analytics × data table

Analytics topics tagged data table

Topics in Analytics carrying the tag data table. Contains a real tabulated dataset.

47 topics

Topic	Participants	Replies	Views	Activity
What a reversed-phase purity number actually is HPLC system suitability data table peak integration Solved The question in the title: What a reversed-phase purity number actually is I will give what I have already checked below so nobody repeats it. I would like to understand what this number means before I repeat…	+87	101	27k	4h
Named, unnamed and unspecified impurities as regulatory categories — the long version HPLC data table forced degradation counter-ion content Wiki Named, unnamed and unspecified impurities as regulatory categories — the long version — setting out what I have, and where I think it stops being reliable. A documentation question rather than an analytical…	+112	120	7.6k	5h
Follow-up: Comparing two chromatograms from different laboratories, properly gradient method system suitability HPLC peak integration Comparing two chromatograms from different laboratories, properly — setting out what I have, and where I think it stops being reliable. I would like to understand what this number means before I repeat it…	+62	67	12k	9h
Deletion sequences: expected mass shifts by residue — the long version water content endotoxin testing data table forced degradation On the subject in the title: Deletion sequences: expected mass shifts by residue — the long version Working notes rather than a conclusion. Working through the identity arithmetic and I would like it checked.…	+21	25	6.9k	10h
Endotoxin and why it is a separate question from purity — what changed since HPLC endotoxin testing data table forced degradation On the subject in the title: Endotoxin and why it is a separate question from purity — what changed since Working notes rather than a conclusion. A documentation question rather than an analytical one. I have…	+78	91	1k	10h
Why 99.2% and 97.8% on the same lot can both be correct system suitability peak integration gradient method data table Solved Why 99.2% and 97.8% on the same lot can both be correct I have a specific reason for asking rather than idle curiosity, and the context is below. I would like to understand what this number means before I…	+16	20	3.1k	11h
Shoulders, tangent skims, and defensible integration peak integration UV & DAD detection HPLC gradient method Posting this under the heading it deserves: Shoulders, tangent skims, and defensible integration Everything below is what sits behind that. Posting the method first, because I know what the first three…	+16	20	11k	13h
Revisiting: Theoretical plates: useful number or ritual? system suitability UV & DAD detection gradient method data table Solved Asking directly, because I could not find a straight answer: Revisiting: Theoretical plates: useful number or ritual? I would like to understand what this number means before I repeat it anywhere. A…	+16	21	1.2k	1d
Impurity thresholds: where the common numbers come from water content data table forced degradation counter-ion content Impurity thresholds: where the common numbers come from — setting out what I have, and where I think it stops being reliable. A documentation question rather than an analytical one. I have a certificate in…	+11	15	825	2d
[2026 update] Why 99.2% and 97.8% on the same lot can both be correct UV & DAD detection system suitability peak integration gradient method Solved Why 99.2% and 97.8% on the same lot can both be correct — that is the question, and I have not found it answered plainly anywhere I have looked. I would like to understand what this number means before I…	+1	5	719	2d
[2026 update] Area percent versus weight percent: the confusion that causes most arguments gradient method UV & DAD detection peak integration data table On the subject in the title: Area percent versus weight percent: the confusion that causes most arguments Working notes rather than a conclusion. Posting the method first, because I know what the first three…	+65	70	1.1k	16d
Carryover and the ghost peak from last week's standard — what changed since gradient method data table HPLC UV & DAD detection Solved Carryover and the ghost peak from last week's standard — what changed since Writing it up because I had to work it out twice and would rather nobody else did. Posting the method first, because I know what the…	+98	114	37k	22d
Deamidation and the close-eluting pair it produces — the long version counter-ion content endotoxin testing data table Posting this under the heading it deserves: Deamidation and the close-eluting pair it produces — the long version Everything below is what sits behind that. I would like to understand what this number means…		3	347	24d
Resolution and tailing factor: real acceptance criteria HPLC gradient method peak integration system suitability Resolution and tailing factor: real acceptance criteria Writing it up because I had to work it out twice and would rather nobody else did. I would like to understand what this number means before I repeat it…		2	15k	1mo
Injection volume, overload, and peak distortion peak integration system suitability HPLC data table Solved Posting this under the heading it deserves: Injection volume, overload, and peak distortion Everything below is what sits behind that. A documentation question rather than an analytical one. I have a…	+43	47	36k	2mo
Area percent versus weight percent: the confusion that causes most arguments system suitability UV & DAD detection HPLC data table Posting this under the heading it deserves: Area percent versus weight percent: the confusion that causes most arguments Everything below is what sits behind that. Posting the method first, because I know…	+10	14	2.1k	2mo
[2026 update] Reading a chromatogram someone posted without axes peak integration HPLC UV & DAD detection data table Posting this under the heading it deserves: Reading a chromatogram someone posted without axes Everything below is what sits behind that. A documentation question rather than an analytical one. I have a…		2	59	2mo
Residual solvents and scavengers: what is looked for — what changed since forced degradation water content data table HPLC Solved Residual solvents and scavengers: what is looked for — what changed since — setting out what I have, and where I think it stops being reliable. Posting the method first, because I know what the first three…	+37	41	7k	2mo
Where impurities in solid-phase peptide synthesis come from water content data table HPLC endotoxin testing Solved Where impurities in solid-phase peptide synthesis come from Writing it up because I had to work it out twice and would rather nobody else did. A documentation question rather than an analytical one. I have a…	+54	59	14k	3mo
Shoulders, tangent skims, and defensible integration — the long version HPLC system suitability peak integration data table Shoulders, tangent skims, and defensible integration — the long version Writing it up because I had to work it out twice and would rather nobody else did. Posting the method first, because I know what the…	+16	20	27k	3mo
Injection volume, overload, and peak distortion — one year on system suitability peak integration gradient method data table Under review Injection volume, overload, and peak distortion — one year on Writing it up because I had to work it out twice and would rather nobody else did. A documentation question rather than an analytical one. I have…	+4	8	1.2k	4mo
Second pass at: Where impurities in solid-phase peptide synthesis come from counter-ion content data table endotoxin testing HPLC Closed Posting this under the heading it deserves: Second pass at: Where impurities in solid-phase peptide synthesis come from Everything below is what sits behind that. A documentation question rather than an…	+47	51	3.3k	5mo
[2026 update] A rising related-substance total over six months: degradation or method drift? forced degradation water content endotoxin testing HPLC Solved Wiki The question in the title: A rising related-substance total over six months: degradation or method drift? I will give what I have already checked below so nobody repeats it. Posting the method first, because…	+71	78	34k	5mo
Trifluoroacetate content and its consequences water content data table forced degradation counter-ion content Trifluoroacetate content and its consequences — setting out what I have, and where I think it stops being reliable. A documentation question rather than an analytical one. I have a certificate in front of me…	+123	134	31k	5mo
Comparing two chromatograms from different laboratories, properly peak integration system suitability UV & DAD detection gradient method Solved Closed Posting this under the heading it deserves: Comparing two chromatograms from different laboratories, properly Everything below is what sits behind that. I would like to understand what this number means…	+35	40	22k	7mo
Where the integrator drew the baseline, and how much it moved the number system suitability gradient method UV & DAD detection data table Solved Where the integrator drew the baseline, and how much it moved the number — setting out what I have, and where I think it stops being reliable. Posting the method first, because I know what the first three…	+20	24	1.6k	8mo
Revisiting: Aggregates and why a purity assay may miss them entirely endotoxin testing HPLC counter-ion content water content Solved Posting this under the heading it deserves: Revisiting: Aggregates and why a purity assay may miss them entirely Everything below is what sits behind that. I would like to understand what this number means…	+48	53	918	8mo
Detection wavelength and why 214 nm and 280 nm disagree peak integration UV & DAD detection system suitability HPLC On the subject in the title: Detection wavelength and why 214 nm and 280 nm disagree Working notes rather than a conclusion. Posting the method first, because I know what the first three replies will…	+78	84	1.7k	8mo
Particulates in a reconstituted solution: identifying the likely source counter-ion content data table HPLC water content Posting this under the heading it deserves: Particulates in a reconstituted solution: identifying the likely source Everything below is what sits behind that. Posting the method first, because I know what the…	+15	19	13k	9mo
Coming back to: Resolution and tailing factor: real acceptance criteria peak integration data table UV & DAD detection Posting this under the heading it deserves: Resolution and tailing factor: real acceptance criteria Everything below is what sits behind that. Posting the method first, because I know what the first three…	+93	112	5.7k	9mo

Sponsored Sigma-Aldrich — certified reference materialsReference standards, analytical reagents and certified materials for method calibration. If you are validating a method, this is where the standard comes from.Reference standards →